package com.bone.common.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
  *
  * @author : WangKeKe
  * @date : 2020/8/14 10:59
  * Description :
  *
*/


@Component
public class SpringContextUtils implements ApplicationContextAware {

   /**
    * 上下文对象实例
    */
   private static ApplicationContext applicationContext;

   @Override
   public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
       SpringContextUtils.applicationContext = applicationContext;
   }

   /**
    * 获取applicationContext
    *
    * @return
    */
   private static ApplicationContext getApplicationContext() {
       return applicationContext;
   }

   /**
     * 获取HttpServletRequest
    */
   public static HttpServletRequest getHttpServletRequest() {
       return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
   }

   public static String getDomain(){
       HttpServletRequest request = getHttpServletRequest();
       StringBuffer url = request.getRequestURL();
       return url.delete(url.length() - request.getRequestURI().length(), url.length()).toString();
   }

   public static String getOrigin(){
       HttpServletRequest request = getHttpServletRequest();
       return request.getHeader("Origin");
   }

   /**
    * 通过name获取 Bean.
    *
    * @param name
    * @return
    */
   public static Object getBean(String name) {
       return getApplicationContext().getBean(name);
   }

   /**
    * 通过class获取Bean.
    *
    * @param clazz
    * @param       <T>
    * @return
    */
   public static <T> T getBean(Class<T> clazz) {
       return getApplicationContext().getBean(clazz);
   }

   /**
    * 通过name,以及Clazz返回指定的Bean
    *
    * @param name
    * @param clazz
    * @param       <T>
    * @return
    */
   public static <T> T getBean(String name, Class<T> clazz) {
       return getApplicationContext().getBean(name, clazz);
   }
}
